Update readme.txt
Update readme.txt

This one has bugged me for a while, since the previous version is blatantly untrue. This is at least a bit better.
rivy/RestSharp,jiangzm/RestSharp,mattwalden/RestSharp,dyh333/RestSharp,rucila/RestSharp,cnascimento/RestSharp,eamonwoortman/RestSharp.Unity,lydonchandra/RestSharp,restsharp/RestSharp,wparad/RestSharp,SaltyDH/RestSharp,huoxudong125/RestSharp,haithemaraissia/RestSharp,KraigM/RestSharp,kouweizhong/RestSharp,benfo/RestSharp,mattleibow/RestSharp,felipegtx/RestSharp,PKRoma/RestSharp,amccarter/RestSharp,dgreenbean/RestSharp,periface/RestSharp,fmmendo/RestSharp,chengxiaole/RestSharp,mwereda/RestSharp,uQr/RestSharp,wparad/RestSharp,who/RestSharp,RestSharp-resurrected/RestSharp,dmgandini/RestSharp